We do use that for idle detection (so we don't count it for your total played time). But for the end-game detection we need to be more accurate because we don't

We do use that for idle detection (so we don't count it for your total played time). But for the end-game detection we need to be more accurate because we don't want to accidentally trigger in the middle of a game (maybe you're waiting for a respawn and stepped away from your comp while dead) and we want to immediately trigger when the game ends so you can't queue for the next one.